I love the game. I didn't play a whole lot of Adventure, mostly just Arcade. I haven't used the Editor at all. Adventure is the most fun, but the most frustrating. I'm a bit of a completionist sometimes, and it is HARD to get stuff sometimes. It often involves the Build gun, which has very limited ammo. It plays like a top down shooter (i maed a gam3 w1th z0mb1es!!!1) where you have a gun, and enemies spawn, and you shoot them. You can get power-ups (Triple Shot, Blaster, Build, even a sword!) and score pickups and multipliers. It's standard, not venturing too far into the unknown combat wise, but that's not always a bad thing. The platforming segments are also fun, and the couple times I've seen in videos the use of a snail enemy's trail to build up to secrets got me a bit excited. Arcade is what you'd expect, waves of enemies pouring out from the sides at your little voxelated hero. Awesomeness ensues. I'd like to draw attention to one thing that I loved, the explosion power up. Guess what it does! Anyway, I find the animation of the explosion hilarious. You can see it if you want.
This whole preview is worth watching, but at around 1:10 the player either gets an explosion pickup or dies (same animation) and hilarity happens. You'll know it when you see it.
The highly manipulable and destructible environments are a lot of fun. I find that playing Arcade, by the time I die the level is so destroyed that restarting I'm actually surprised by how it looked before. The enemy variants are REALLY cool. You'll see the big guys made up of smaller guys and a dragon in that trailer. There are also the little purple rolling guys, and the big guys with the lasers (that last one isn't in the trailer). I know my descriptions are astonishingly well thought out. The point is this game shines in a lot of ways. The visual style is unique, the only game I know of using it besides Voxatron is 3D Dot Game Heroes. Level designs are cool, until you shoot them up a bit, then they're awesome. I cut down a tree with a gun. How weird is that? Overall, the game is pretty creative, really addicting, and not too frustrating. It's still in alpha, so the only way to get it is through the Humble Voxatron Debut! Obviously expect changes, since it's in alpha. 9/10